While driving my '88 300ce down the freeway in the heat of the day the SRS light comes on for about 2 to 8 seconds then goes off in 10 to 20 second intervals. It seems to only happen when its hot outside and usually only driving down the freeway.

Would this have anything to to do with a worn out alternator? The only reason I ask is when idling with the headlights on I can see the dash lights and headlights will fade in and out like its not pulling enough amps!